Drier.



F. A. HETHERINGTON.

DRIER. APPLICATlON FILED APR. 28. 1915.

1,178,188. Peteneed' Feb. 29, 1916.

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rnnnn'mci; A. HETHERINGTON, or INDIANAPOLIS, INDIANA.

To all whom it may concern: L r Be it known that I, FREDER CK A. 'HETH- ERINGTON, a ,citizen of theUnited States, residing at Indinapolis, in the county of Marion and State of Indiana, have invented a new and useful Drier, of which the following is a'specification;

My invention relates to driers for paving materials.

in some cases these materials being highly refractory and practically incombustible, such as sand, gravel, and crushed stone, and ,in other cases being readily combustible,-

such as wood. In the first case, the mate:

rials can be. dried by the direct action of the flames thereon, but in the second case such direct action of the flames would destroy the materials and therefore cannot be It is the object of my present invention to provide a drier which can be used as desired for either class of paving materials, giving the direct or indirect action of the flames as required. I

In carrying outmyinventiomI provide adrier-drum and a furnace, and two draft passages ;from the furnace, one of these draft passages being through the drier-drum and the other being around the drier-drumwithout passing through it, and means for controlling the draft so as to carry it "through either of these passages as desired.

1 The accompanying drawing illustrates 1 my invention, its single figure being a vertical sectional view ing my invention. I Y O The drier-drum 10 is shown as being r0- tatably mounted, with .a driving gear 11 at 'one' end, and is located within but spaced from a casing '12 'which at one end at the 1 bottom is provided with afurnace' 13. A feed chute leiprojectsintg the drum 10 from gone end, for supplying materials" thereto," a5 and at the other end the druin is provided with a series of-peripheral holes 15, from which the dried material is discharged on to any suitable conveyer 16 for conveying it v away." The drum 10 1s provided with in through a drier embodyternal flights 17 for conveying the material from the feed chute 14 to the discharge opening's 15, and preferably these flights are of proper shape to produce a mixing of -the materials. i; A' draft outlet'tube 20 'projects into the drum 19 from the same'end as does the feed Pavements are made of various materials,

ppm.

, Specification of Letters Patent. paibq gflgefl Feb. 29, 11916 Application filed April '28,

1915. Serial No. 2 1,408.

chute 14,;this draft outlet tube being provided witha damper 21 and leading to the supply tube 22'of a centrifugal fan 23. -The discharge of the centrifugal fan is intd'a 6o stack24. At the top of the casing 12 there is a draft outlet 25, which is connected by a pipe 26 to the same supply tube 22 for the fan 23, and in the-pipe 26 there is a second damper 27; In operation, the draft from the furnace 13 has two alternative paths to the centrif u'gal fan 23; Ifthe damper 21 is open and the damper 27 r closed, as indicated in the drawing; the draft from the furnace 13 is first longitudinal of the drums (with some circumferential movement also, of course) to the openings 15, through which openings the draft enters the driimand then travels longitudinally therethrough to.. the dra t outlet tube 20,whence it passes through the damper 21 and supply tube" 22 to the fan 23, which discharges it through the stack 24. The flames within the furnace are carried withthe draft and play directly onthe material within the drum 10., so that this draft passage is used when the materials in the drum are incombustible. However, when the materials are combustible, the damper 21 is closed and thedamper 27 is opened, whereupon the draft and flames y from the furnace 13 are carried around' the exterior of the drum 10'but within the cas-. 'ing 12, and are dischargedat the top of the casing 12 by way of the draft outlet 25,- whence they travel through the pipe 26 and damper 27 to 'theinlet tube 22 for the fan 23, which discharges them through 'the stack 24. e i

I claim as my invention: v 1 Adrier, comprising the combination of a rotatable drum haviffg an opening at one end for the discharge of material from it .and a feed chute discharging into its other end, a draft outlet from said drum at the o'pposite end fromsuch opening, a casing v surrqundmg the drum a furnace discharg mg its products of combustion into such casing, a draft outlet from. suchicasing, a,

centrifugal fan to the inlet. side of which 19 both of'isaid draft outlets areconnected, anda separate damper in the connection beiween each of said draft outlets'andj said an. Y

2. A drier, comprising" the combination of a rotatable drum having an opening at" one end for the discharge of material from,

it and a feed chute-discharging into itsother end, a draft outlet from said drum at the opposite end from such opening,'a cas-- ing surrounding thedrum, a furna'cedischarging its products of combustion into such casing, a draft outlet from such (cas ing, and means draft outlets.

3. A drier, comprising the combination of a drum having an opening at one end, a

for closing each of said draft outlet from said drum at the oppositeend from such opening, a casing surrounding the drum, a furnace dlscharging its products of combustlon into such .casmg, a

draft outlet from such casing, a centrifugal fan to the inlet si'deof which both of said draft outlets are connected, and a separate damper in the connection between said draft outlets and said fan.

4. A drier, comprising the combination V of a drum having an opening at one end, a

draft outlet from said drum at the opposite endfrom such opening, a casing surroundingthe drum, a furnace discharging its products of combustion into such casing, a draft outlet from such casing, and means for closing each of said draft outlets.

5. A drier, comprising the combination of a drum, a furnace, and means for directing the draft. from the furnace either through such drum or around such drum without passing through it as desired and in each case closing the other of s uch pas:

- sages for such draft.

- 6. A drier, comfrising the combination of a drum, a furnace, means for producing va forced draft from ,such furnace, and

means for directingsuc'h forced draft from the furnacein' its entirety either through each of the drum or around the drum' witliout passing through it as desired. A, drier, comprising the coinbination of a drum a furnace, a blower for 'producing a draf ,from the furnace, and COI1I16C;, tions between the furnace, the drum, and' the blower providing two alternative draftleads to said casing and to said draft inlet opening, and means for closing either of said draft outletopenings.

9. A drier, comprising the combination of a drum having a draft inlet opening and a draft outlet opening, a casing surrounding the-drum and having a draft outlet opening, a furnace the draftfrom which leads to said casing and to said draft inlet opening, and means for closing either the draft path from the furnace through the. drum or that from the furnace through the casing around the drum.

- In witness whereof, I have hereunto set my hand at Indianapolis, Indiana, this 16th day of April, A. D. one thousand nine hundred and fifteen. J

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Witnesses:

FRANK A. FAHLE, Mar LAYDEN. 

